Friedrich Wilhelm Sturz (1762-1832) published his edition of the Etymologicum Gudianum in 1818. It is based on the Greek manuscript Gud. gr. 29 / 30 in the famous Herzog August Bibliothek at Wolfenbüttel, and was the first printed edition of the complete work, introduced by a Latin preface. The Etymologicum Gudianum is a Greek lexical encyclopaedia compiled in southern Italy during the tenth century. It was one of the main sources of the better known Etymologicum Magnum compiled in the middle of the twelfth century. Not only is the Gudianum a rich and valuable source of citations from lost ancient Greek works, it represents the high point of medieval encyclopaedia-writing and Greek scholarship. Sturz's edition was a key reference work for generations of classicists, Byzantinists and medievalists.